OCM Metric Triangular Engineer Scale Ruler (Proffessional Grade Solid Aluminum) 30 Centimeters Metric Engineering Architectural Mechanical Drafting Ruler - 1:20, 1:25, 1:50 1:75, 1:100, 1:125

OCM 1 Triangular Architect Scale Ruler (Professional Grade Solid Aluminum) Color Coded 12 Inch Architectural Scale (Imperial Measurements) - Ideal for Architects, Engineers, Draftsman and Students

Alumicolor 3000 Series 12-Inch Silver Hollow Aluminum Triangular Engineer Scale (3230-1)

Alvin, LX810G, Clear Acrylic Triangle 2-Piece Set, Angle 30/60 and 45/90

Mars Comfort 551 Precision Compass

Arteza 12" Triangular Architect Scale Aluminum Color-Coded Grooves (Imperial)

eBoot Large Triangle Ruler Square Set, 30/60 and 45/90 Degrees, Set of 2

OCM 1 Laser Etched Engineer - 12 Inch Anodized Triangular Engineer Imperial Scale Ruler (Proffesional Grade Solid Extruded Aluminum) Imperial Scale Civil Engineering Architectural Drafting Ruler

Intoy 12 Inch Triangular Engineer Scale Ruler, Anodized Solid Aluminum Core with Laser Etched Scales, Imperial Scale - 1:10, 1:20, 1:30, 1:40, 1:50, 1:60, Ideal for Civil Engineering Drafting

Architectural Scale Ruler (Imperial) and Engineer Scale Ruler Set - Two 12 Inch Aluminum Triangular Scale Rulers with Protective Sleeves

Engineering Scale Ruler (Laser-Etched) Solid Aluminum Core | 12 Inch Triangular Engineer Ruler with Imperial Measurements